how to define index in angular material table
Solution 1
Can you add index
to let element; let i = index;"
as you'd do with *ngFor
?
<mat-row *matRowDef="let row; columns: displayedColumns; let i = index"></mat-row>
Or like so:
<ng-container matColumnDef="index">
<mat-header-cell *matHeaderCellDef> Index </mat-header-cell>
<mat-cell *matCellDef="let element; let i = index;">{{i}}</mat-cell>
</ng-container>
Working Example: https://stackblitz.com/edit/angular-acdxje?file=app/table-basic-example.html
Solution 2
For anyone who has set the multiTemplateDataRows
property of mat-table to true, you can't use index
. Instead you have use either dataIndex
or renderIndex
.
<mat-cell *matCellDef="let row; let i = dataIndex;">{{i}}</mat-cell>
See https://github.com/angular/material2/issues/12793
Solution 3
For those who are facing problem with keeping the right index when using pagination which table has more than 1 page. It can be especially important when you have editable element, thus you're using a routerLink to add/edit/delete selected elements.
<ng-container matColumnDef="title">
<mat-header-cell *matHeaderCellDef mat-sort-header>Title</mat-header-cell>
<mat-cell *matCellDef="let book; let i = index;" fxLayoutAlign.lt-md="center center">
<button mat-button [routerLink]="[i + (paginator.pageIndex * paginator.pageSize)]" routerLinkActive="active"</button>
</mat-cell>
</ng-container>
As well as
<mat-paginator #paginator [pageSize]="5" [pageSizeOptions]="[5, 10, 25, 100]"></mat-paginator>
In essence, i + (paginator.pageIndex * paginator.pageSize) is the solution, but it counts from 0. If you'd like to index from 1, simply make it (i+1) + (paginator.pageIndex * paginator.pageSize). Worth to note is that you really need the #paginator and [pageSize]="VALUE".
Solution 4
If someone using <mat-paginator ../>
, then index can be interpreted as below
<mat-cell *matCellDef="let element; index as i"> {{paginator.pageSize * paginator.pageIndex + i + 1}}</mat-cell>
Solution 5
From Angular 5 you can alias index
to local variable i
using index as i
<ng-container matColumnDef="rowIndex">
<mat-header-cell *matHeaderCellDef> Index </mat-header-cell>
<mat-cell *matCellDef="let element;index as i;"> {{ i }} </mat-cell>
</ng-container>
Related videos on Youtube
pushplata patel
Updated on July 08, 2022Comments
-
pushplata patel almost 2 years
how should I define an index variable when angular material table is used as ngFor is not used in this table.
I did search for it in the documentation but index is not mentioned any where in it.
<mat-table #table [dataSource]="dataSource"> <!--- Note that these columns can be defined in any order. The actual rendered columns are set as a property on the row definition" --> <!-- Position Column --> <ng-container matColumnDef="position"> <mat-header-cell *matHeaderCellDef> No. </mat-header-cell> <mat-cell *matCellDef="let element"> {{element.position}} </mat-cell> </ng-container> <!-- Name Column --> <ng-container matColumnDef="name"> <mat-header-cell *matHeaderCellDef> Name </mat-header-cell> <mat-cell *matCellDef="let element"> {{element.name}} </mat-cell> </ng-container> <!-- Weight Column --> <ng-container matColumnDef="weight"> <mat-header-cell *matHeaderCellDef> Weight </mat-header-cell> <mat-cell *matCellDef="let element"> {{element.weight}} </mat-cell> </ng-container> <!-- Symbol Column --> <ng-container matColumnDef="symbol"> <mat-header-cell *matHeaderCellDef> Symbol </mat-header-cell> <mat-cell *matCellDef="let element"> {{element.symbol}} </mat-cell> </ng-container> <mat-header-row *matHeaderRowDef="displayedColumns"></mat-header-row> <mat-row *matRowDef="let row; columns: displayedColumns;"></mat-row> </mat-table> </div>
where and how do i define an index variable for the array that I used in this table, so that I can bind the index value in my table itself.
-
Igor Dimchevski about 6 yearsCan you handle the index value and set it when you fetch the data from the API?
-
pushplata patel about 6 yearsI'm sorry, I didn't get you. Can you be more clear?
-
-
pushplata patel about 6 yearsThank you. Will try it and let you know if it's working :)
-
Roberto Zvjerković about 6 yearsNo problem. Here is a working StackBlitz example. stackblitz.com/edit/angular-acdxje?file=app/…
-
Muhammad Ali almost 5 yearsThanks a lot. This is exactly what I was looking for :)
-
Nestor Perez over 4 yearsThank you, you save my day :D
-
Ramiro G.M. over 4 yearsWorks! But I'd love to know where this came from....how did you know there's a variable index available to be consumed? Can someone explain this further please?
-
Aamer Shahzad over 4 years
<td td mat-cell *matCellDef="let index = index">{{ (index + 1) + (paginator.pageIndex * paginator.pageSize) }}</td>
works best for paginated data table. thanks. -
Limey about 4 yearsyou deserve all the up votes! i spent over an hour trying to figure out why my index didn't work till I came across your golden nugget! Thanks so much!
-
Eslam Sameh Ahmed about 4 yearsTake care that it will repeat per page if you enabled pagination
-
Eslam Sameh Ahmed about 4 yearsTake care that it will repeat per page if you enabled pagination
-
Saurabh Tiwari over 3 years
Worth to note is that you really need the #paginator and [pageSize]="VALUE".
This is the real key. -
Kasun over 3 yearsif you have pagination you can calculate row index like
{{this.paginator.pageIndex * this.paginator.pageSize + i}}
-
Santosh over 3 years
let i=dataIndex
this is working for me. -
Mohamed Musthaque about 3 yearsAs mentioned in a comment above, please remove "this" keyword and try as {{paginator.pageIndex * paginator.pageSize + i}} and will work.!
-
Sandeep Kumar over 2 yearsThanks a lot, it's working. {{ i + (paginator.pageIndex * paginator.pageSize) + 1}}
-
Mohamed Fahmy over 2 yearsthis answer is a treasure